Variable Interest Entities ("VIEs") (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Variable Interest Entities
Assets	$ 16,272,418	$ 16,493,375
Total liabilities	9,909,221	9,980,263
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities
Assets	56,019	68,223
Variable Interest Entity, Primary Beneficiary
Variable Interest Entities
Assets	5,001,249	4,423,995
Total liabilities	$ 2,764,740	$ 2,345,726